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bonsai418
04-28-2008, 11:59 PM
This is what I ordered for my Oly E-510:
B+W 58ES Circular Polarizer Multicoated Filter.

This filter is specially designed to be used with auto-exposure and auto-focus SLR and video cameras. It does not influence the metering systems of these cameras. Filter factor is 2.3 to 2.8.

What does the --> Filter factor is 2.3 to 2.8 mean ???
ladyups
04-29-2008, 02:34 AM
Hi, Linda...see if this answers your question.

http://en.wikipedia.org/wiki/Filter_factor
bonsai418
04-29-2008, 02:56 AM
@Mary,
I have looked at the web site, but this (resident)Alien needs more info. Do I have to step the F/stop up or down when the filter is on ?
ladyups
04-29-2008, 03:42 AM
Well, duh...I have not a clue...:rolleyes: I searched a bit more but only came up with EV loss. So...I'm guessing you would compensate in the EV instead of changing your f-stop. I sure hope someone steps in that knows more about this than I do. Sorry, I'm not much help, I'm just a beginner too and so far, all I know for sure is I love taking photos.
LensBaby
04-29-2008, 03:45 AM
Jerry will know !! O Jerry where art thou?
bonsai418
04-29-2008, 03:46 AM
@Mary,
Thank you for trying.
Still sooooo much to learn. But going out and taking pictures is fun.
LensBaby
04-29-2008, 03:49 AM
Linda, just when I think I know the basics...guess what? I was wrong!
jerryph
04-29-2008, 12:29 PM
If it decreases light coming in, you will have to open up the aperture to compensate. Of course that or increase ISO or decrease shutter speed.
bonsai418
04-29-2008, 12:35 PM
@Jerry,
Thank you
bonsai418
05-01-2008, 04:30 PM
Been playing around with the polarizing filter, something I do find odd is the lighter strip on the left side of the picture ( no work done on the pic, just cropped it)
Is this normal with a polarizer??
bonsai418
05-01-2008, 05:22 PM
Hm, the problem seems to be monitor related because when I loaded the pic's on to my laptop the stripe on the left was NOT there.
jerryph
05-01-2008, 10:20 PM
I don't see that strip, but I can tell that there is a dropping off of light on the top right side of the pic. This is part of the effect of what a CPL does.

http://dpfwiw.com/polarizer.htm

http://www.fas.harvard.edu/~scdiroff/lds/LightOptics/CircularPolarization/CircularPolarization.html
bonsai418
05-02-2008, 11:00 AM
@Jerry,
Thank you for the links, but now I'm more confused then I was before:eek::eek::eek:.